Reports on prognostic factors of anorexia nervosa differentiate positive, negative and irrelevant data. However, these fields stand in parallel without quantification and thus without aspiring a hierarchical order. Establishing such an order by relative importance is the aim of this study in which we report on n = 113 patients. Among these prognostic factors from the time before, during and after hospitalization are investigated empirically. The patients' present state acts as a criterion (follow-up after 6.4 years). The relevant factors are set up hierarchically and investigated by multivariate analysis with special respect to relative importance of somatic, psychological or social variables. Finally we give therapeutic recommendations.